Bolster.



i i PATENTED MAY 19,v l19(1),3.

T. MITCHELL.

BoLsTBR;

APPLICATION FILED JUNE Z0, 1902. A

N0 MODEL.

WITNESSES= TH: Nonms Frans co., wnooumu. wAsHmouN. u. c.

UNITED STATES" Patented May 19, 1903.

(PATENT OEEICE.

THOMAS MITCHELL, or CHESTER, PENNSYLVANIA, ASSIGNOE To DANIE EAGAN, or PHILADELPHIA, PENNSYLVANIA. j

BOLSTER.

SPECIFICATION forming part of .Letters Patent No. 728,270, dated May 19, 1903.

20 @ZZ whom, it 'may'oonoe'I/L:

Be it known that I, VlHoI/IAS MITCHELL, a citizen of the United States, residing at Chester, in the county of 'Delaware and State of Pennsylvania, haveinvented certain new and useful Improvementsin Bolsters, of which the following is a specification. Y

My improvements relate to bolsters of the type. known as the box form, and which are conveniently made of cast steel.

ble, lightness and strength, so that the least possible quantity o'f'metal will be consumed or employed in producing a bolster adapted to support a given load orresistgi'ven strains.

Such diminution of weight as is consistent with the requisite strength, is desirable in a.v

bolster not only because proportionate to the lightness is a diminution of rst cost, by reason of the diminished amount of metal required in construction,` but alsobecause diminution of the weight of the bolsters represents a proportionate economy in the propulsion of the cars in Connection with which they are employed.

It is the object of my invention to produce a bolster of such form that it will possess greater strain resisting capacity, in proportion to the amount of metal required in its construction, than kindred holsters as heretofore made.

In the accompanying drawings I show, and herein I describe, a good form of a convenient embodiment of my invention, the particular subject-matter claimed as novel being hereinafter denitely specified.

In the drawings,

Figure l is a view partly in vertical longitudinal section, and partly in side elevation, of a bolster embodying my invention.

A Figure 2 is aview in top plan of the bolster shown in Figure l. i

Figure 3 is a View in end elevation -of the bolster. Y Y .l

Figure Atis a transverse section on the dotted line 4-4 f Figure 2.

Figure 5 is a transverse section on the dotted line 5-5 of Figure 2.

In' the' construction of bolsters,"itV is desirable to so. fashion themas to combine, as .far as possi! Applioation led June 20,1902. Serial No. 112,421. (No model.)

top plate d, side walls e, and pairs of vertically extending column guidesf. f `g is a sleeve for the kinggpin, saidV sleeve .being shown as formed as integral with and connective of the topand bottom plates. l

' 'h are flanges laterally projecting from the respective sides of the bolster, in the plane of the top plate.` Said hangers, which are shown as of length less than that of the .bolster, and as terminating respectively at points vabout abreast of the respective sidebearings,

are preferably of considerable' breadth at the center of the bolster, and gradually diminish insbreadth from their centers to their ends.

The bottom plate or wall il is for a region preferably of lengthgless thanthat of the bolster,- and extending conveniently from a point aboutinfline below one side bearing to a point arranged to form an elongated concavity, preferably of the full Width of said p1ate that is to say, the bottom plate, which is preferably of 'about uniform thickness from edge to edge, inelines in the region referred to, upwardly from its respective4 side edges to the vicinity of the major axis of' the said plate. The said plate is, therefore, so to speak, inwardly curved, shaped or bent,-or,expressed broadly, embodies a concavity. Said concavity is of considerable depth at the central portion of the bolster, and becomes gradually shallower at its respective ends as shown. The bottom plateatthe respective'ends of the bolster is preferably fiat.

In the bolster illustrated/,the longitudinally extending conca'vity is of angular, that is to say, approximately V-shaped, section.

The concavity may, however, vary in its sectional profile at the will of the constructor.

Vabout in line below the other side bearing,

I prefer, in the interest of lightness and economy of metal, not to form said bottom plate or Wall as transversely continuous at all points, but to provide or form in it openings such as those designated j.

The openingsj may, of course, be omitted, or they may be made of any desired form and s1ze.

The bolster herein described is designed to be made as a single integral casting of steel.

Having thus described my invention, I claim- 1. A cast steel box bolster, the respective sides of the bottom wall or plate of which, at the intermediate portion of the structure, in eline upwardly from the outer edges, to the region of the major axis of said wall or plate.

2. A bolster having a wall embodying a longitudinally extending concavity in breadth approximately equal to its own.

3. A bolster having a wall or plate of approximately V-shaped section, substantially as set forth.

4. A bolster of box form, the bottom wall or plate of which embodies a longitudinally extending concavity of breadth approximately equal to its own.

5. A cast steel box bolster, the bottom Wall or plate of which, at the intermediate portion of the structure, is upward-ly inclined from its respective edges to the region of the major axis of said wall or plate, the concavity thus formed being of the full breadth from side wall to side wall of the bolster, and said concavity being ot' less length lthan the bolster.

6. A bolster ot' the box form, the central portion of the bottom Wall or plate of which is npwardlyinclined from its respective edges to the region of the major axis of said wall or plate, the concavity thus formed beingr approxi mately equal to the breadth of said bottom plate, said bolster having a king bolt sleeve integral with its top and bottom walls or plates.

7. A bolster of box form, the bottom Wall or plate ot which embodies a concavity of breadth approximately equal to its own, and is provided with openings, said bolster having a king bolt sleeve integral with its top and bottom plates.

8. A bolster of box form, the bottom wall or plate of which embodies a concavity ot' breadth approximately equal to its own, and ot' gradually diminishing depth at its respective ends, said plate having openings formed in its concave region, said bolster having a king bolt sleeve integral with the top and bottom Walls or plates.

9. Abox bolster having a top plate, an inwardly curved bottom plate, a king bolt sleeve extending from the central region ot' the curved bottom plate to the top plate, and integral with both, and [langes formed at the respective sides ofthe top plate of the bolster.

10. A box bolster havinga top plate, an in- Wardlycurved bottom plate, a king bolt sleeve extending from the central region of the curved bottom plate to the top plate and integral with both, and flanges formed at the respective sides of the top plate of the bolster, said flanges being of a given width at the center ot' the bolster, and tapering to- Ward their respective ends.

ll. A bolster of box form the bottom plate or wall of which is liat at its respective ends and in its central portion embodies a longitudinally-extending concavity.

l2. A bolster of box form the bottom plate or wall of which is flat at its respective ends and in its central portion embodies a longitudinally-extending concavity, said bottom plate or wall embodying in its concave region a series of openings.

In testimony that I claim the foregoing as my invention I have hereunto signed my name this 12th day of June, A. D. 1902.

THOMAS MITCHELL.

In presence of- THos. K. LANCASTER, S. SALoMn BROOKE. 

